So today I ran our computer through the built in package updating system in Ubuntu 14.04 to do some updates that we have put off for a while (Did this to try and fix the "hanging on reboot" issue). Unfortunately, now we can't login through the main login GUI. Whenever I type in the proper login info, the screen just goes black for a second then goes back to the login page. I have tried recursively changing the file permissions of my home directory, and have also tried removing .Xauthority, neither of which have solved said issue. I'd greatly appreciate it if someone could give me some clues as to where I should be looking next to fix this issue. I can provide any log file information that you feel would be helpful, no problem. Thanks for your time.
EDIT: Forgot to mention that I also cannot login through Guest Session, it does the same loop thing. I can login through the command line, however.
EDIT 2: So now I'm trying to access the computer from home using x11vnc. When I run that, I get the error "Invalid MIT-MAGIC-COOKIE-1 key09/05/2015 14:07:24 XOpenDisplay(":0") failed." I'm not sure if that's a symptom of the root problem, or if thats because I was unable to login via gui last night.